As nouns the difference between slight and thing
is that
slight is the act of slighting; a deliberate act of neglect or discourtesy while
thing is (chiefly|historical) a public assembly or judicial council in a germanic country.
As an adjective slight
is small, weak or gentle; not decidedly marked; not forcible; inconsiderable; unimportant; insignificant; not severe.
As a verb slight
is to treat as slight or not worthy of attention, to make light of.